Comment 23 for bug 562361

Hmmm... What I can not understand is why 4.6.2 works for you.

It is true, that 4.6.2 ignores ftpfs_use_passive_connections_over_proxy, because this option was introduced later:

SHA1 ID: 2bba061bf0405acd4898d203b52e8f992c784fa5
Committer: Leonard den Ottolander <email address hidden> 2005-05-29 14:10:08

     * src/boxes.c, vfs/ftpfs.[ch]: Add checkbox to allow passive FTP
     over proxy to VFS dialog.

Also, for some strange reason, this option is off by default. BUT, before this patch, passive connections over proxy didn't happen at all:

     if (SUP.proxy)
- SUP.use_passive_connection = 0;
+ SUP.use_passive_connection = ftpfs_use_passive_connections_over_proxy;

This is confirmed by your Wireshark dump. On the other hand, with 4.7.* the very same active connection fails (?!), yet passive connection works.

I have to compare the dumps more carefully.